Energy storage devices with high energy density as well as high power density are expected to be developed from the point of view of compensation of fluctuating load and generated power by wind turbines and photo voltaic generation. SMES (Superconducting Magnetic Energy Storage) has higher power density than other energy storage methods, and secondary batteries have higher energy density than SMES. The hybrid energy storage method using SMES and secondary batteries is proposed, and the computation method of power reference value for each device and the simulation method is presented in this paper. Experimental results are also presented.
